Track it. Hunt it. Claim the ultimate trophy. Please see below for more details.
How to Hunt the T. Rex
Purchase a decoy goat from the truck at Base Camp.
Head to the T. Rex Zone marked on the map.
Use the decoy goat inside the T. Rex Zone.
After a short while, the T. Rex will appear and come to eat the decoy goat.
Dynamite for Hunting Large Creatures
Use dynamite to take down the T. Rex with ease.
Dynamite explodes when stepped on by the T. Rex or when shot by the player.
Dynamite only affects the T. Rex and the player. (No effect on regular animals)